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Mirrors > Home > MPE Home > Th. List > djuenun | Structured version Visualization version GIF version |
Description: Disjoint union is equinumerous to union for disjoint sets. (Contributed by Mario Carneiro, 29-Apr-2015.) (Revised by Jim Kingdon, 19-Aug-2023.) |
Ref | Expression |
---|---|
djuenun | ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷 ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ∪ 𝐷)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | djuen 10239 | . . 3 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ⊔ 𝐷)) | |
2 | 1 | 3adant3 1132 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷 ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ⊔ 𝐷)) |
3 | relen 9008 | . . . 4 ⊢ Rel ≈ | |
4 | 3 | brrelex2i 5757 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ∈ V) |
5 | 3 | brrelex2i 5757 | . . 3 ⊢ (𝐶 ≈ 𝐷 → 𝐷 ∈ V) |
6 | id 22 | . . 3 ⊢ ((𝐵 ∩ 𝐷) = ∅ → (𝐵 ∩ 𝐷) = ∅) | |
7 | endjudisj 10238 | . . 3 ⊢ ((𝐵 ∈ V ∧ 𝐷 ∈ V ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐵 ⊔ 𝐷) ≈ (𝐵 ∪ 𝐷)) | |
8 | 4, 5, 6, 7 | syl3an 1160 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷 ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐵 ⊔ 𝐷) ≈ (𝐵 ∪ 𝐷)) |
9 | entr 9066 | . 2 ⊢ (((𝐴 ⊔ 𝐶) ≈ (𝐵 ⊔ 𝐷) ∧ (𝐵 ⊔ 𝐷) ≈ (𝐵 ∪ 𝐷)) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ∪ 𝐷)) | |
10 | 2, 8, 9 | syl2anc 583 | 1 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≈ 𝐷 ∧ (𝐵 ∩ 𝐷) = ∅) → (𝐴 ⊔ 𝐶) ≈ (𝐵 ∪ 𝐷)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ w3a 1087 = wceq 1537 ∈ wcel 2108 Vcvv 3488 ∪ cun 3974 ∩ cin 3975 ∅c0 4352 class class class wbr 5166 ≈ cen 9000 ⊔ cdju 9967 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2158 ax-12 2178 ax-ext 2711 ax-sep 5317 ax-nul 5324 ax-pow 5383 ax-pr 5447 ax-un 7770 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3or 1088 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2065 df-mo 2543 df-eu 2572 df-clab 2718 df-cleq 2732 df-clel 2819 df-nfc 2895 df-ne 2947 df-ral 3068 df-rex 3077 df-rab 3444 df-v 3490 df-dif 3979 df-un 3981 df-in 3983 df-ss 3993 df-pss 3996 df-nul 4353 df-if 4549 df-pw 4624 df-sn 4649 df-pr 4651 df-op 4655 df-uni 4932 df-int 4971 df-br 5167 df-opab 5229 df-mpt 5250 df-tr 5284 df-id 5593 df-eprel 5599 df-po 5607 df-so 5608 df-fr 5652 df-we 5654 df-xp 5706 df-rel 5707 df-cnv 5708 df-co 5709 df-dm 5710 df-rn 5711 df-res 5712 df-ima 5713 df-ord 6398 df-on 6399 df-suc 6401 df-iota 6525 df-fun 6575 df-fn 6576 df-f 6577 df-f1 6578 df-fo 6579 df-f1o 6580 df-fv 6581 df-1st 8030 df-2nd 8031 df-1o 8522 df-er 8763 df-en 9004 df-dju 9970 |
This theorem is referenced by: dju1en 10241 djucomen 10247 djuassen 10248 xpdjuen 10249 onadju 10263 pwxpndom2 10734 |
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